Sensory perception depends on the response of each receptor and on how sensory message spread on the brain. This message is described by a fuzzy point process, and is measured by the fuzzy covariability of the stimulus and the sensory response. Information convergence and divergence determine the topology of its processing space. Sensory processing is formalized as a string of images elicited by the stimulus in this processing space. . Expert sensory systems change the topology of the processing space by modifying the degree of convergence/divergence according to previous learning. 549570